hi.. i have had three new hardwood stable style doors fitted, two are exterior and one just inside the house, i want to use sikkens to protect the hardwood, i'm confused as to which or what sikkens to buy, there is a filter protection one and a 'centrol' one.. i've heard of a basecoat and finishing coat but don't know which is what !!.. who knows what the correct application is and which one's do i get.. any comments much appreciated